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I several times heard that one way to describe the collapse of the wave-function is to add non linearities in the Schrodinger equation (I know that this approaches are not convincing but that's not my point), however, I don't see why a non linear SE would imply loss of unitarity? As long as the Hamiltonian is hermitean, or real if you see it as a function of [itex]\psi[/itex] and [itex]\psi^*[/itex], we can derive an equation of probability conservation.

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# How does a non-linear Schrodinger equation implies non-unitary evolution?

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